Off the top of my head, he was going to bailout the mortgage holders, reign in the banks, close Gitmo, end the wars in Iraq and Afghanistan, pass universal healthcare, and end warrantless wiretaps. He either abandoned those objectives (sometimes when he held a super-majority) or technically did something but not really (like ending the warrantless wiretap program but creating a mass surveillance program). Anyway, maybe, "radical leftist," is a little hyperbolic, but he ran further to the left than anyone had since the 70s and he governed slightly to the left of George W.